Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).

WSGI-compliant HTTP publisher for Python

Otto uses a routes-like syntax to map URLs to code and supports object traversal.

RFC 2396 (1998) specifies that relative URIs like //foo get resolved as http://foo. This means, if you link a resource like http://example.ms/, @href could as well just point to //example.ms/.

PostBin lets you debug web hooks by capturing and logging the asynchronous requests made when events happen. Make a PostBin and register the URL with a web hook provider. All POST requests to the URL are logged for you to see when you browse to that URL.

HTTP and URIs are the basis of the World Wide Web, yet they are often misunderstood, and their implementations and uses are sometimes incomplete or incorrect.

This document tries to improve this situation by providing a set of good practices to improve implementations of HTTP and related standards (Web servers, server-side Web engines), as well as their use.

RED checks HTTP resources to see how they use HTTP, makes suggestions, and finds common protocol mistakes.